Telephone switch



May 10 C. W. WILKERSON TELEPHONE SWITCH Filed Aug. 31. 1925 l the base by Patented May 16, 1.927.

.CQOBER wVII-I'lfClWiIIilLD .WILKzETt-SON, 'OF'BIRMINGI -IAM, ALABAMA.

TEEEPHONE 1 SWITCH.

Application filectAugusti-Zl, 1925. Serial No. 53,573.

The present invention relates to .ialrimproved 'ztelephone sswitch it'or use on telephones of the desk type portable telephone is adapted for use on a double or extension line. The telephone provided with a single switch lever adapted for selective use with either of two telephones and their circuits, and by the utilization of the device of my invention the hollow base of the telephone is employed for compactly combining and arranging the parts of the device, thus preserving the port ability of the telephone for ordinary use and the switch parts are placed or located in convenient position out of the way of the user. The selective switch however is in convenient position for use and the parts enclosed within the hollow base are readily accessible when necessary for repairs or adjustment.

The invention consists in certain novel Combinations and arrangements of parts within the hollow base or bowl of the telephone stand as will hereinafter be more fully set forth and claimed.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention in a telephone stand in which the parts are combined and arranged in accordance with the best mode I have thus far devised for the prac tical application of the principles of my invention.

Figure 1 is a view in elevation of a standard type of telephone in which my invention is embodied, with a diagrammatic showing of the wires.

Figure 2 is a plan view of the switch, the base of the telephone being shown in section at line 22 of Figure 1.

Figure 3 is a detail view of the switch, enlarged, at line 3-3 of Figure 2.

In order that the general arrangement and assembly of parts may readily be understood I have shown in Figure l the conventional type of desk telephone comprising the usual hollow base 1, hollow post2, transmitter 3 and receiver 4 with the customary switch hook 5 for supporting the receiver.

In the hollow base 1 I utilize a base block 6 of insulating material whichv is secured in means of nutted screws or bolts 7, for the support of the switch members.

The base block is provided with two sets or pairs of arcuate conductor plates 8 8 and 9 9 preferably of copper and fastened in the wherein a single,

block byameans" of n-utted screws-..oribolts.-10 s-1 me oi which 2;!6'.11S8d':'f01 iterminalsiof the various circuits in wiring the switch.

A switch lever 11 is pivoted on the pin 12 which is secured in the base 1 at the center of the arcs of the pairs of conductor plates as best shown in Figure 2, and the free end of the lever projects through a slot 13 in the hollow base in order that the lever may readily be accessible for swinging on its pivot 12 to make and break circuits in connection with the two pairs of conductor plates.

The lever is provided with two terminals 14 and 15 and these terminals include contact pins 141 and 15 respectively of the terminals for contact with the plates 8 or 9 and S or 9. Thus it will be apparent that by swinging the lever up in Figure 2 a circuit may be completed through the pins in contact with plates 9 and 9'; or by swinging the lever down in Figure 2 contact may be made by the contact pins with plates 8 and 8. This swinging movement of course is'in a horizontal plane when the telephone stand is erect.

The usual main cord 16 is employed together with the usual connection or cord 17 for the receiver and cord 18 in the hollow base, and the bell or signal is operated in usual manner from the central station.

The receiver cord 17 and cord 16 enter the hollow base as usual and within the base the wires for the two switches are also enclosed. Two terminals 10 of the conductor plates 9 and 9' are used for connecting the cord 18 of one side of the switch while two terminals 10 of the plates 8 and 8 are used. for connecting the cord 19 of the other side 01? the switch. The switch lever 11 is provided with a wire 21 to its terminal 15 and a wire 22 to its terminals 14, which as indicated by dotted lines in Fig. 1 are connected with the transmitter and receiver in usual manner, while the pairs of cords 19 and 20 are embodied in the main cord 16.

For convenience of illustration the switch 11 is shown in cut out position in Figure 2. When a ring comes in on the phone the lever may be turned or swung for instance to contact with plates 921ml 9 and the circuit made from the cord 16 through wires 10 therein, of a plurality of spaced pairs of arcuate conductor plates supported in said block, a laterally movable switch lever pivoted intermediate said pairs of plates with its free end projecting through the slotted base, and spaced contact pins on said lever for selective co-action with said spaced pairs of plates.

In testimony whereof I hereunto affix my signature.

COOPER WHITFIELD WlLKERSON. 

